4 A local courier service reports that 90% of bulk parcels within the same city are delivered within two days. Six parcels are randomly sent to different locations. a. What is the probability that all six arrive within two days? (Round the final answer to 4 decimal places.) Probability 01:06:20 b. What is the probability that exactly five arrive within two days? (Round the final answer to 4 decimal places.) Probability c. Find the mean number of parcels that will arrive within two days. (Round the final answer to 2 decimal place.) Number of parcels d-1. Compute the variance of the number that will arrive within two days. (Round the final answer to 3 decimal places.) Variance d-2. Compute the standard deviation of the number that will arrive within two days. (Round the final answer to 4 decimal places.) Standard Deviation